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Three Cadmium Tartratoborates with Good Second Harmonic Generation (SHG) or Luminescence Performances

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journal contribution
posted on 2018-12-10, 00:00 authored by Ting-Ting Ruan, Chun-Li Hu, Jiang-He Feng, Fei-Fei Mao, Jiang-Gao Mao
Three new cadmium­(II) tartratoborates, namely, Cd5[(C4H2O6)2B]2(H2O)8·3H2O (1), K2Cd4[(C4H2O6)2B]2(H2O)2 (2), and Li0.92K1.08Cd1.5[(C4H2O6)2B]­(H2O)2 (3), have been successfully synthesized by the hydrothermal method. Compounds 1–3 belong to centric C2/c, acentric Pc, and the polar C2, respectively. Through based on the same hybrid borate–tartrate [(C4H2O6)2B]5– anions, they exhibit different structures. The [(C4H2O6)2B]5– anion is composed of two tartrate anions and a B­(OH)4 unit. Compound 1 features a novel 3D network formed by 2D {Cd3[(C4H2O6)2B]2(H2O)2}4– anionic layers and [Cd2O10] dimers, forming tunnels of large 14-MRs which are filled by the non-coordination water molecules. Compound 2 has a characteristic 3D network based on {Cd2[(C4H2O6)2B]} units interlinked via carboxylate groups, forming tunnels of 11-MRs, half of which stuffed with the K+ ions. Compound 3 features 2D {Cd4[(C4H2O6)4B]}3+ layers which are separated by K/Li ions. Luminescent studies suggest that they emit blue light. Compounds 2 and 3 display phase-matchable second harmonic generation signs of about 3.2× and 1.5× KH2PO4, respectively.